From patchwork Fri Sep 13 17:32:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Mattson X-Patchwork-Id: 13803883 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 824D3126C11 for ; Fri, 13 Sep 2024 17:32:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726248776; cv=none; b=di0/gUpkqPTUkXkjTOaayleHPns9alAy93A4z/KZIP56Eo63JMo1kK2qTjSSCPJP2Q2Cs/FqrUzjp6fCbx0zgGteaTmtLJxEDkDDDD5BHTsR20cH9gz785HZpj+o9zN64XyA2wn9mzi4McZJbncQ8r+SyzwIJXkC1/p+p9+pFzk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726248776; c=relaxed/simple; bh=xjay2CBwiCBq12bGlndFnnErz6A9u1ntnHfvd8gjIxA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=AfBbA6k6uSgUstj427eSf6r0Q7v2F0J5j9GRyIsxT0XbZP8rRaG1FWkZCTe71XTxABMNpOQSNw+7U4rPelgsgm5xwfeTRUx3kVAoJwRqSm5GIjB9McDHAwuUjuXop43EP4MC0I7lBDNwq/uhWSveoja6/EYRPoSJRlcQO8nfl0w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jmattson.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=g4m3+MVz; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jmattson.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="g4m3+MVz" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6d9e31e66eeso31792527b3.1 for ; Fri, 13 Sep 2024 10:32:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1726248774; x=1726853574; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=l3WawTJXscEZHW+HHwjyEYFYW96KcqSVaobUybf0kTc=; b=g4m3+MVzeTgN/iLC2AEsSuQ7xIHfGV30ls7b7F2heHALW/zioDMSvHm7WWkK4FLiZW 0WbSBPLYESKeMmONW6jrjs0oKXKxXx38jbHJYL0ZFQe13uUP0U8GUIqaCzTH2y0fgPDu b93ubuiX280MHKu5YuOaz3FXCMo+qWPJ6PyK5Jj2rWVXmR78sHs0y8x1T/F2GQEO3a0a J6YYRLe3cIzgmOvnVQXXH0Ir9AzXdjLLK9w06EstozKw2uNijUMh/2QO4ImFgI5Jp+tx 9RLoyGJS4sBmJ9StXxEtjicn2u29vvuxPeP8fSa87mbcNg/y87P+nP2idKws+lYC4yFj 3Hzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726248774; x=1726853574; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=l3WawTJXscEZHW+HHwjyEYFYW96KcqSVaobUybf0kTc=; b=IM8tFxoaS2AenikPmHdUhXyobm6Dj4mT57m4sltc0rGEIHMR8l6jtaCnOESex4BHG2 yua5SvLke50OqtviCHDtr36nbfuznYw68sdYHC3X4IXu+saKjR5hCL/IYpwois8ocE1C +cLqjYa7gI8r7dHpFv3PPnY7QyMngKBEySLXw9NnOhoRZW7U03Xy9x6yabPLYQNHOcYt ne8VRNiTiMqxSnAvHj1qgrZ/9NGMD5IQjpcOo0q1mbZBsUceNIJRIKQ6+5dzm6fYHhiJ EVY8coNO/rAkx156IMD2I+laYF8U+/v9cpTa8SA2wTSGFc61ptbGvueYlXEqQtdyfl7O f3hA== X-Forwarded-Encrypted: i=1; AJvYcCW3yn/nizEge5tmfNt2VSOPeNI6GuhSRKddrk5GbGe7Pc465Ynz3ENHM1o8AeehgScRV1I=@vger.kernel.org X-Gm-Message-State: AOJu0Yxow7WDlbrnwg0qFTszT5YfDxsiZVK3nxeCTCSXP6wI/SL4X1sN r7fhBf77bthNbyl3xSKVI0HCPiIt9VvwkZZIB8xAKeHPY5Rj1XuRW11yHu3MU6nDkxnQ2MUEqNL v/jqqUYqQkQ== X-Google-Smtp-Source: AGHT+IH1DurPlTxXWjA3nswyL98NGzJfftHUY2cOTogCVmKjqUSTXxMzYDUdelJDMpXHUhHOWBbACI4EY1DVmA== X-Received: from loggerhead.c.googlers.com ([fda3:e722:ac3:cc00:f3:525d:ac13:60e1]) (user=jmattson job=sendgmr) by 2002:a81:b049:0:b0:68d:cbd6:e28 with SMTP id 00721157ae682-6dbcc579af6mr673767b3.6.1726248774214; Fri, 13 Sep 2024 10:32:54 -0700 (PDT) Date: Fri, 13 Sep 2024 10:32:28 -0700 In-Reply-To: <20240913173242.3271406-1-jmattson@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240913173242.3271406-1-jmattson@google.com> X-Mailer: git-send-email 2.46.0.662.g92d0881bb0-goog Message-ID: <20240913173242.3271406-3-jmattson@google.com> Subject: [PATCH v4 2/3] KVM: x86: Advertise AMD_IBPB_RET to userspace From: Jim Mattson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Sean Christopherson , Paolo Bonzini , Pawan Gupta , Josh Poimboeuf , Jim Mattson , Sandipan Das , Kai Huang , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Tom Lendacky This is an inherent feature of IA32_PRED_CMD[0], so it is trivially virtualizable (as long as IA32_PRED_CMD[0] is virtualized). Suggested-by: Tom Lendacky Signed-off-by: Jim Mattson --- arch/x86/kvm/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 2617be544480..ec7b2ca3b4d3 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -751,7 +751,7 @@ void kvm_set_cpu_caps(void) F(CLZERO) | F(XSAVEERPTR) | F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) | - F(AMD_PSFD) + F(AMD_PSFD) | F(AMD_IBPB_RET) ); /*